{
  "abstract": "The world's first adaptive stellar coronagraph, the Programmable Liquid-crystal Active Coronagraphic Imager for the 4-m DAG telescope (PLACID) uses a spatial light modulator operating from H- to Ks-band to dynamically adjust the focal-plane phase mask entirely in software. Positioned between the TROIA XAO system and the DIRAC infrared detector, PLACID was installed on the Nasmyth platform of the Turkish 4-m DAG telescope in 2025, followed by optical alignment and successful preliminary acceptance tests with the calibration light source in early 2026. On-sky commissioning is expected, as soon as the TROIA XAO system will be operational. When on-sky, it will enable high-contrast imaging of exoplanets, brown dwarfs, disks, and binary systems, being able to easily deploy any desired phase pattern in the focal plane. Upcoming features include self-calibration of non-common path aberrations, coronagraphic nulling of binary-stars, and coherent differential imaging. We present the preliminary acceptance procedures and internal alignment results, discovery-space estimates, new binary star features and observation tools, to be ready for first science by late 2026/early 2027.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.28226",
  "author_total": 12,
  "authors": [
    {
      "name": "Ruben Tandon"
    },
    {
      "name": "Lucas Marquis"
    },
    {
      "name": "Liurong Lin"
    },
    {
      "name": "Derya Öztürk Çetni"
    },
    {
      "name": "Axel Potier"
    },
    {
      "name": "Audrey Baur"
    },
    {
      "name": "Iljadin Manurung"
    },
    {
      "name": "Matthias Brändli"
    },
    {
      "name": "Martin Rieder"
    },
    {
      "name": "Daniele Piazza"
    },
    {
      "name": "Laurent Jolissaint"
    },
    {
      "name": "Jonas G. Kühn"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/ba8ez7a2b0c1d.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.28226",
  "fulltext_url": null,
  "id": "ba8ez7a2b0c1d",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.28226",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.EP"
    ],
    [
      "arxiv",
      "astro-ph.IM"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2608.28226",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/ba8ez7a2b0c1d.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:22Z",
      "native_id": "2608.28226",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.28226"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.IM",
      "subfield": "instrumentation-methods"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.EP",
      "subfield": "planetary"
    }
  ],
  "title": "The PLACID active coronagraphic imager instrument: commissioning status",
  "title_text": "The PLACID active coronagraphic imager instrument: commissioning status",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:22Z",
  "url": "https://research.draconitic.com/paper/ba8ez7a2b0c1d",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1117/12.3102879",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}